[RFC PATCH v2 0/3] Add PCIe enclosure management support

From: Stuart Hayes <stuart.w.hayes@gmail.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
	linux-pci@vger.kernel.org,
	Dan Williams <dan.j.williams@intel.com>
Cc: Keith Busch <kbusch@kernel.org>,
	kw@linux.com, mariusz.tkaczyk@linux.intel.com,
	helgaas@kernel.org, lukas@wunner.de, pavel@ucw.cz,
	linux-cxl@vger.kernel.org, martin.petersen@oracle.com,
	James.Bottomley@hansenpartnership.com,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Stuart Hayes <stuart.w.hayes@gmail.com>
Subject: [RFC PATCH v2 0/3] Add PCIe enclosure management support
Date: Wed,  2 Feb 2022 11:59:10 -0600	[thread overview]
Message-ID: <cover.1643822289.git.stuart.w.hayes@gmail.com> (raw)

This patch set adds support for two PCIe enclosure management methods,
"Native PCIe Enclosure Management" (defined in the PCI Express Base Spec)
and "_DSM Definitions for PCIe SSD Status LED" (defined in the PCI
Firmware Spec). The latter is very similar to the former, but uses a _DSM
interface (which can be provided by firmware) rather than a PCIe
extended capability.  Each provides a way to control up to ten indicator
states (such as locate, fault, etc.)

There are three patches in the set:

(1) Expands the existing enclosure driver to support more
indicators.

(2) Adds an auxiliary driver "pcie_em" that can attach to auxiliary
devices created by the drivers of any devices that can support PCIe
enclosure management (nvme, pcieport, and cxl).  It will register an
enclosure device with one component for each device with an enclosure
management interface.

(3) Modifies the nvme driver to create an auxiliary device to which the
pcie_em driver can attach.

These patches do not modify the cxl or pcieport drivers to add support,
though the driver was designed to make it easy to do so.
---
v2:  fixed compile error related to switch default in enclosure.c
     added documentation of added sysfs attributes
---

Stuart Hayes (3):
  Add support for seven more indicators in enclosure driver
  Add PCIe enclosure management auxiliary driver
  Register auxiliary device for PCIe enclosure management

 .../ABI/testing/sysfs-class-enclosure         |  14 +
 drivers/misc/enclosure.c                      | 191 ++++---
 drivers/nvme/host/pci.c                       |  11 +
 drivers/pci/pcie/Kconfig                      |   8 +
 drivers/pci/pcie/Makefile                     |   1 +
 drivers/pci/pcie/pcie_em.c                    | 473 ++++++++++++++++++
 include/linux/enclosure.h                     |  22 +
 include/linux/pcie_em.h                       |  97 ++++
 include/uapi/linux/pci_regs.h                 |  11 +-
 9 files changed, 749 insertions(+), 79 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-class-enclosure
 create mode 100644 drivers/pci/pcie/pcie_em.c
 create mode 100644 include/linux/pcie_em.h

-- 
2.31.1